Puller for crank-pins, &amp;c.



G. G. KEPLER. FULLER FO/R CRANK PINS, 6L0. APPLICATION FILED FEB. a, 1920.

1,393,026. Patented Oct. 11, 1921.

UNITED STATES" PATENT OFFICE.

GEORGE Gr. KEPLER, OF POTTS'IOWN, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HENRY D. SAYLOR, 0F POTTSTOWN, PENNSYLVANIA.

PULLEB FOR CRANK-PINS, 8w.

Specification of Letters Patent.

Patented Oct. 11, 1921.

Application filed February 6, 1920. Serial No. 356,711.

To all whom it may concern:

Be it known that I, Gnoncn G. KEPLER, a citizen of the United States, residing in Pottstown, Pennsylvania, have invented certain Improvements in Pullers for Crank Pins, &c., of which the following is a specification.

My invention relates to certain improvements in devices for removing crank pins and like articles, which have been driven into openings and which must be withdrawn under certain circumstances.

The invention is especially adapted for pulling the crank pins of gas engines of motor cycles. These pins have a slight taper and are driven into the tapered opening in the fly wheel of the engine. In some types of engines, it is necessary to dismantle the engine partially before the pin can be driven out from the back. By my invention, the pin can be withdrawn from its seat from the front without dismantling the other parts of the engine.

The object of the invention is to improve a puller of this type so that the jaws can be forced under the head of the pin, or other device, or under the connecting rod, as the case may be, the pin being positively pulled without injury to the parts.

In the accompanying drawings:

Figure 1 is a View in elevation of my improved crank pin puller, showing the jaws engaging the connecting rod, which is located between the head of the pin and the fly wheel;

Fig. 2 is a view, similar to Fig. 1, showing the jaws forced under the rod and lifting the pin from its seat;

Fig. 3 is a longitudinal sectional view of my improved puller;

Fig. 4; is a detached perspective view of the lower portion of one of the jaws; and

Fig. 5 is a view illustrating a modification.

1 is a fly wheel. 2 is a connecting rod. 3 is a pin having a head 4:, the pin 3 passing through an opening in the rod. The pin is slightly tapered and is adapted to a tapered opening in the fly wheel and is driven into place by force.

My improved tool consists of a cross bar 5 to which are pivoted two arms 6, at 17. These arms are bent abruptly at the lower end and terminate in tapered jaws 18, which have sharp points, and are curved at the edge, as at 5, so as to fit under the headof the crank pm, or under the connecting rod,

or other device, which is held by the pin.

7 is a nut connected at 8 to links 19, which are, in turn, connected to the outer ends of the arms 6 at 10. In the present instance, the pivots 17 8 and 10 are in the form of bolts on which are nuts, but it will be understood that rivets, or pins, may be used. The nut 7 has a threaded opening therein for the passage of the screw 11, which has a reduced end that rests in a socket in a block 12 forming part of the cross bar 5. A handle 13 is secured to the opposite end of the screw 11 by which the screw can be turned.

1% is a guide plate which is secured to the cross bar 5. This guide plate is bent at the upper end at 15 and is notched to engage the screw 11 and hold it in a central position. While I prefer to use the guide Plate 14:, it may be dispensed with in some instances.

The operation is as follows: The tool is placed in the position illustrated in Fig. 1 with the ends of the jaws at the point between the connecting rod and the fly wheel and on turning the screw these jaws are forced under the rod and gradually lift the pin from its seat. ,The moment the pin is moved it becomes comparatively loose, due to its slight taper. As the jaws are sharp at the edge and tapered, they can be forced under the rod without marring either the rod or the fly wheel. The slight curve at the edge 9 of the jaws allows the jaws to have a considerable bearing.

While the invention is especially adapted for pulling crank pins, it can also be used for drawing stud pins on which are mounted small gears and other devices. In fact, it can be used for drawing pins of any description.

In Fig. 1, the screw is shown as independ ent of the cross bar and merely bearing on the cross bar when pressure is applied, but the screw may be connected to the cross bar, as at 16, Fig. 5, the screw having a threaded extension which passes through an opening in the block 12 of the cross bar and through washers on either side of the cross bar. A nut is applied to the end of the screw, as shown, so as to fasten the screw to the cross bar. The screw is preferably loose in the bearing $9 that it will accommodate itsel 'to any movement of the nut without bending.

I claim 1. The combination in a puller for pins and like objects, of a cross bar, two arms pivoted to said bar, the lower end of each arm having a tapered jaw terminating in a sharp edge, adapted to be forced between the head of a pin and the object to which it is attached, and means for forcing the upper end of said arms apart, causing the jaws to be forced toward each other to lift the pin from the object to which it is attached, said means comprising a screw, a member through which said screw extends, and links connecting the said member to the uppe end of said arms.

2. The combination in a tool for pulling pins and like objects, of a cross bar; two arms pivoted to the cross bar, each arm having a tapered jaw at its lower end adapted'to pass under the head of a pin, or an object held by the pin; a nut; a screw extending through the nut and bearing upon the cross bar; and links connecting the nut with the end of the arms opposite the jaws.

3. The combination in a puller for pins and like objects, of a cross bar; two arms pivoted to the cross bar, each arm having a tapered jaw, each jaw being curved at the edge; a nut; links connecting the nut with the arms; and a screw extending through the nut and bearing upon the cross bar.

GEORGE G. KEPLER. 

